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At Pad 17-B on Cape Canaveral Air Force Station, the Delta II first stage and nine solid rocket boosters have been erected. During preparations to hoist the second stage atop the first stage, an incident occurred which caused an adapter beam associated with the lifting operation to fracture. As a result, the stacking operation was immediately stopped. A team has been appointed to investigate the incident. Once the team has concluded its investigation and is able to determine there was no damage to the second stage, a new date for stacking will be set, possibly as early as next week.

Meanwhile, at the Astrotech payload processing facility, the GLAST spacecraft's solar array illumination test has been completed. The Ku-band communications transmitter was installed as scheduled. Closeouts of the spacecraft thermal blankets are under way. The Ku-band communications antenna will be installed early next week. At this time, preparations continue for delivery of GLAST to the launch pad on May 2.